Hi all,

my speedo is out by at least 5%
When the satnav says constant 50 mph my speedo says 55mph.

The wheels I have fitted are 225/40/18's 8J
I had the same problem with my previous wheels 215/50/17's 7J

Does anyone know what setting have I got to choose from in the ECU via Tech 2?
And which one to change it to?

Thanks